Ann Romney is pictured at the first presidential debate Wednesday at the University of Denver. She attended a fundraiser in Loveland earlier in the day. / Michael Reynolds/The Associated Press

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Ann Romney, wife of Republican presidential nominee Mitt Romney, attended a fundraiser at a private home in Loveland on Tuesday that did not appear on her public schedule, a source close to Romney’s campaign confirmed Thursday.

About 100 people paid between $1,000 and $25,000 to greet Mrs. Romney at the home of Troy McWhinney, co-founder of the development firm behind the Centerra shopping center. Costs varied based on access to the prospective first lady, with those who met her individually and had photos taken with her paying more than those who simply attended. The fundraiser concluded a day of campaign stops in Denver.

The sum raised during the event has not yet been reported to the Federal Election Commission, which as of Monday showed President Barack Obama, a Democrat, ahead of Romney in fundraising in the Fort Collins-Loveland area. Obama had collected $182,339 to Romney’s $131,776, according to the Center for Responsive Politics.

McWhinney contributed $2,500 to Romney’s campaign in February — the maximum allowed before the GOP nomination was decided. Federal Election Commission records show McWhinney Holding Company and members of the McWhinney family have contributed a total of $4,500 to Republican congressional candidates Eric Weissmann and Mike Coffman and to the Colorado Republican Campaign Committee.

The Colorado Republican Campaign Committee had paid $466,000 to Strategic Allied Consulting, a national consulting firm that the Colorado Republican Party severed ties with this week after evidence surfaced indicating the company had fabricated voter registration information in Florida.

On Thursday, the Colorado Secretary of State’s Office confirmed in correspondence to the watchdog organization Colorado Ethics Watch that Strategic Allied Consulting is under investigation by prosecutors in Colorado’s 18th Judicial District, which includes Arapahoe, Douglas, Elbert and Lincoln counties.

Andrew Cole, spokesman for the Colorado Secretary of State’s Office, said the investigation centers on a former employee of Strategic Allied Consulting who, while working for the firm, destroyed a voter registration form. His supervisor reportedly brought the situation to the state’s attention.